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Vulnerability record · CVE-2020-2252 · published 16 September 2020

CVE-2020-2252: Jenkins mailer improper certificate validation vulnerability

Jenkins · Mailer

Jenkins Mailer Plugin 1.32 and earlier does not perform hostname validation when connecting to the configured SMTP server.

4.8 CVSS 3.1 Medium EPSS 0.96% · top 39.9% CWE-295 · Improper certificate validation
4.8CVSS 3.1 base score, v2 5.8
0.96%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Jenkins Mailer Plugin 1.32 and earlier does not perform hostname validation when connecting to the configured SMTP server.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2020/09/16/3 Third Party Advisory
https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1813 Vendor Advisory
http://www.openwall.com/lists/oss-security/2020/09/16/3 Third Party Advisory
https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1813 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.0CVE-2018-8718Jenkins mailer cross-site request forgery vulnerabilityCross-site request forgery (CSRF) vulnerability in the Mailer Plugin 1.20 for Jenkins 2.111 allows remote authenticated users to send unauthorized ma…EPSS 6.5%4.3CVE-2022-20613Jenkins mailer cross-site request forgery vulnerabilityA cross-site request forgery (CSRF) vulnerability in Jenkins Mailer Plugin 391.ve4a_38c1b_cf4b_ and earlier allows attackers to use the DNS used by t…EPSS 0.96%4.3CVE-2022-20614Jenkins mailer missing authorization vulnerabilityA missing permission check in Jenkins Mailer Plugin 391.ve4a_38c1b_cf4b_ and earlier allows attackers with Overall/Read access to use the DNS used by…EPSS 1.1%3.7CVE-2017-2651Jenkins mailer information exposure vulnerabilityjenkins-mailer-plugin before version 1.20 is vulnerable to an information disclosure while using the feature to send emails to a dynamically created …EPSS 1.6%9.8CVE-2026-85102Checkpoint gaia embedded improper certificate validation vulnerabilityImproper certificate trust validation during VPN negotiation in Check Point Quantum Security Gateway may allow an unauthenticated remote attacker to …KEVEPSS 0.99%5.5CVE-2023-41991Apple iOS, iPadOS and macOS certificate validation bypassApple iOS, iPadOS and macOS contain an improper certificate validation flaw (CWE-295) that lets a malicious app bypass signature validation. Apple st…KEVEPSS 13%analysed7.8CVE-2023-20963Android WorkSource parcel mismatch local privilege escalationCVE-2023-20963 is a parcel mismatch in Android's WorkSource component that allows a local attacker to escalate privileges without additional executio…KEVEPSS 1.5%analysed8.8CVE-2022-26923Microsoft Active Directory Domain Services certificate validation privilege escalationActive Directory Domain Services fails to properly validate certificate attributes, allowing a low-privileged domain user to obtain a certificate tha…KEVEPSS 84%analysed

Source: NIST National Vulnerability Database (record CVE-2020-2252), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.